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首页> 外文期刊>Environmental Science & Technology >Influence off Surface Charge Distributions and Particle Size Distributions on Particle Attachment in Granular Media Filtration
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Influence off Surface Charge Distributions and Particle Size Distributions on Particle Attachment in Granular Media Filtration

机译：颗粒介质过滤过程中表面电荷分布和粒度分布对颗粒附着的影响

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摘要

Filtration experiments were performed with a laboratory-scale filter using spherical glass beads with 0.55 mm diameter as collectors. Suspensions were made with Min-U-Sil 5 particles, and two different methods (pH control and polymer dosing) were used for destabilization. In the pH control experiments, all particles had negative surface charge, and those with lower (absolute value) charge were selectively attached to the collectors, especially during the early stage of filtration. This selective attachment of the lower charged particles caused the zeta potential distribution (ZPD) of the effluent to move to a more negative range. However, the ZPD of the effluent did not continue moving to more negative values during the later stages of filtration, and this result was attributed to two reasons: ripening effects and detachment of flocs. In the polymer experiments, substantial differences were found between experiments performed with negatively charged particles (underdosing) and those with positively charged particles (overdosing). With under-dosing, the results were similar to the pH control experiments (which also had negatively charged particles), but with overdosing, the effluent's ZPDs in the early stages did not overlap with those of the influent and more highly charged particles were removed more efficiently than lesser-charged particles. It is hypothesized that, despite a substantial period of pre-equilibration of media and coagulant, this equilibrium shifted when particles were also added. It was assumed that coagulant molecules previously adsorbed to the particles desorbed and subsequently attached to the filter media because of surface area differences in the particle and filter media.
机译：用实验室规模的过滤器进行过滤实验，使用直径为0.55 mm的球形玻璃珠作为收集器。用Min-U-Sil 5颗粒制成悬浮液，并使用两种不同的方法（pH值控制和聚合物计量）来稳定。在pH控制实验中，所有颗粒都带有负表面电荷，而那些具有较低（绝对值）电荷的颗粒则选择性地附着在收集器上，尤其是在过滤的早期。较低电荷粒子的这种选择性附着导致流出物的zeta电位分布（ZPD）移至更负的范围。但是，废水的ZPD在过滤的后期并没有继续向负值移动，这一结果归因于两个原因：熟化效果和絮凝物分离。在聚合物实验中，发现带负电粒子（剂量不足）和带正电粒子（剂量过量）的实验之间存在实质性差异。剂量不足时，结果类似于pH控制实验（也带有带负电的颗粒），但剂量过量时，出水的ZPD在早期阶段不会与进水的ZPD重叠，并且带走更高电荷的颗粒会更多比荷电较少的粒子更有效。假设尽管培养基和凝结剂有很长时间的预平衡，但当还添加颗粒时，该平衡发生了变化。假定由于颗粒和过滤介质中的表面积差异，先前吸附到颗粒上的凝结剂分子解吸并随后附着到过滤介质上。

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  • 来源
    《Environmental Science & Technology》 |2008年第7期|p.2557-2562|共6页
  • 作者

    JINKEUN KIM; JEFFREY A. NASON; DESMOND F. LAWLER;

  • 作者单位

    Department of Civil, Architectural, and Environmental Engineering, The University of Texas at Austin, C1786 Austin, Texas 78712;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境化学;
  • 关键词

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